Quote:
Originally Posted by 6233638
Well, I liked what this seemed to be doing for colour and gamma, though it definitely needed improved somewhat, but I definitely seemed to be noticing a lot more banding, though I never got around to doing a proper test.
From the beginning of Pitch Black:
Original:
yCMS:
ArgyllCMS:
This is exactly the sort of problem you get when using too much data to create a LUT, as I warned about before.
Any ideas on what can be done to improve things? |
The problem is you are using a spectrophotometer (i1 Pro?) and it doesn't give accurate reading in low light measurements.
I have ColorMunki and i1 Display 2 and user ColorMunki only for creating correction matrix for Display2. Then I do the actual calibration with Display2. But still, it doesn't get the low light measurents well.
At first I didn't understand ti3-file is used only for the black end. I tried using MPC-HC's own ICC-CMS and black end seemed ok. I think MPC-HC's CMS uses LittleCMS and it also creates 3dlut internally.
Easy but not perfect solution was to use yCMS and only ti3-file. You don't get perfect calibration though.
Launch TI3ParserGUI.exe and open your ti3-file and you'll see what the problem is.
My grayscale values were:
0, XYZ, 0, 0, 0
1.7857, XYZ, 0, 0, 0
3.5714, XYZ, 0, 0, 0
5.3571, XYZ, 0.027882, 0.02763, 0.042054
7.1429, XYZ, 0.10489, 0.10941, 0.1317
8.9286, XYZ, 0.2645, 0.28805, 0.2925
10.714, XYZ, 0.4104, 0.43535, 0.45801
12.5, XYZ, 0.65471, 0.69213, 0.6966
etc.
The problem in my file is values for 1.7857, 3.5714 and even 5.3571 are too low so my colorimeter doesn't get any values or they are inaccurate. Because program sees to low values, it tries to raise the values in 3dlut, and there you go, gray instead of black.
Simple but not perfect and final solution is just to drop those inaccurate values. So I copy&pasted those values to madVR's yCMS and used these values for gray scale:
0, XYZ, 0, 0, 0
7.1429, XYZ, 0.10489, 0.10941, 0.1317
8.9286, XYZ, 0.2645, 0.28805, 0.2925
10.714, XYZ, 0.4104, 0.43535, 0.45801
12.5, XYZ, 0.65471, 0.69213, 0.6966
etc.
I just wish we could have a version that has an option to only use ICC-files and LittleCMS.